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A water treatment system utilising Cross’s automatic backwashing filtration technology is enabling recycled water to be used instead of mains water in the vehicles used for stand cleaning at Gatwick.

Surface water from the 674 hectare airport flows into a perimeter-sited lake before treatment and drainage into a stream.

Raw water from the lake is already used in the airport’s fire tenders and with the new treatment plant can also be safely used in the sweeper washer vehicles.

Treatment is necessary for this application in order to remove particles that can block the spray bar nozzles on the vehicles and to eliminate any risks from harmful bacteria, including legionella.

The Cross-designed treatment plant – comprising the filter, UV disinfection equipment, pumps, valves, controls and stainless steel pipework – is contained within a compact weatherproof housing.

Operation is fully automatic under PLC control.

Water from the lake is pumped into the Cross Phoenix filter, which removes all solid particles above 50 microns, and through the UV treatment tube before filling an adjacent 35,000 litre storage tank.

When the tank is full the supply from the lake is shut-off and water from the tank re-circulated through the filter and UV tube.

The system is designed to switch between the recirculating and tank-filling circuits as the water is used, without interruption to the vehicle-filling operations.

As the sweeper washer vehicles are in constant use in the airport’s 120-aircraft standing and apron areas, the new package will provide savings in the cost of mains water usage.

Initial consumption readings suggest that close to one million litres of mains potable water will be saved annually by the use of this grey water recycling facility.

At the same time the new plant is centrally sited, saving the vehicles the repeated long journeys across the airport that used to be necessary in order to reach the mains water fill-up area.

Cross Manufacturing

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